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<a name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a name="2" href="#2">2</a>   <em class="jxr_comment"> * OpacitySetter.java</em>
<a name="3" href="#3">3</a>   <em class="jxr_comment"> *</em>
<a name="4" href="#4">4</a>   <em class="jxr_comment"> * Created on August 3, 2007, 8:06 PM</em>
<a name="5" href="#5">5</a>   <em class="jxr_comment"> *</em>
<a name="6" href="#6">6</a>   <em class="jxr_comment"> * This library is free software; you can redistribute it and/or</em>
<a name="7" href="#7">7</a>   <em class="jxr_comment"> * modify it under the terms of the GNU Lesser General Public</em>
<a name="8" href="#8">8</a>   <em class="jxr_comment"> * License as published by the Free Software Foundation; either</em>
<a name="9" href="#9">9</a>   <em class="jxr_comment"> * version 2.1 of the License, or (at your option) any later version.</em>
<a name="10" href="#10">10</a>  <em class="jxr_comment"> *</em>
<a name="11" href="#11">11</a>  <em class="jxr_comment"> * This library is distributed in the hope that it will be useful,</em>
<a name="12" href="#12">12</a>  <em class="jxr_comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</em>
<a name="13" href="#13">13</a>  <em class="jxr_comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU</em>
<a name="14" href="#14">14</a>  <em class="jxr_comment"> * Lesser General Public License for more details.</em>
<a name="15" href="#15">15</a>  <em class="jxr_comment"> *</em>
<a name="16" href="#16">16</a>  <em class="jxr_comment"> * You should have received a copy of the GNU Lesser General Public</em>
<a name="17" href="#17">17</a>  <em class="jxr_comment"> * License along with this library; if not, write to the Free Software</em>
<a name="18" href="#18">18</a>  <em class="jxr_comment"> * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA</em>
<a name="19" href="#19">19</a>  <em class="jxr_comment"> */</em>
<a name="20" href="#20">20</a>  <strong class="jxr_keyword">package</strong> com.totsp.gwittir.client.fx.rebind;
<a name="21" href="#21">21</a>  
<a name="22" href="#22">22</a>  <strong class="jxr_keyword">import</strong> com.google.gwt.user.client.DOM;
<a name="23" href="#23">23</a>  <strong class="jxr_keyword">import</strong> com.google.gwt.user.client.ui.UIObject;
<a name="24" href="#24">24</a>  
<a name="25" href="#25">25</a>  
<a name="26" href="#26">26</a>  <em class="jxr_javadoccomment">/**</em>
<a name="27" href="#27">27</a>  <em class="jxr_javadoccomment"> * This is an opactiy setter than works by parsing the alpha() block</em>
<a name="28" href="#28">28</a>  <em class="jxr_javadoccomment"> * on the MSIE "filter" CSS property.</em>
<a name="29" href="#29">29</a>  <em class="jxr_javadoccomment"> * @author &lt;a href="<a href="mailto:cooper@screaming-penguin.com" target="alexandria_uri">mailto:cooper@screaming-penguin.com</a>"&gt;Robert "kebernet" Cooper&lt;/a&gt;</em>
<a name="30" href="#30">30</a>  <em class="jxr_javadoccomment"> */</em>
<a name="31" href="#31">31</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> OpacitySetterIE6 <strong class="jxr_keyword">extends</strong> <a href="../../../../../../com/totsp/gwittir/client/fx/rebind/OpacitySetter.html">OpacitySetter</a> {
<a name="32" href="#32">32</a>      <em class="jxr_javadoccomment">/**</em>
<a name="33" href="#33">33</a>  <em class="jxr_javadoccomment">     * Text of the alpha block.</em>
<a name="34" href="#34">34</a>  <em class="jxr_javadoccomment">     */</em>
<a name="35" href="#35">35</a>      <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String ALPHA = <span class="jxr_string">"alpha("</span>;
<a name="36" href="#36">36</a>  
<a name="37" href="#37">37</a>      <em class="jxr_javadoccomment">/**</em>
<a name="38" href="#38">38</a>  <em class="jxr_javadoccomment">     * Text of the opacity block.</em>
<a name="39" href="#39">39</a>  <em class="jxr_javadoccomment">     */</em>
<a name="40" href="#40">40</a>      <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String OPACITY = <span class="jxr_string">"opacity="</span>;
<a name="41" href="#41">41</a>  
<a name="42" href="#42">42</a>      <em class="jxr_javadoccomment">/**</em>
<a name="43" href="#43">43</a>  <em class="jxr_javadoccomment">     * A string containing number characters for comparison.</em>
<a name="44" href="#44">44</a>  <em class="jxr_javadoccomment">     */</em>
<a name="45" href="#45">45</a>      <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String NUMBERS = <span class="jxr_string">"1234567890."</span>;
<a name="46" href="#46">46</a>  
<a name="47" href="#47">47</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Creates a new instance of <a href="../../../../../../com/totsp/gwittir/client/fx/rebind/OpacitySetter.html">OpacitySetter</a> */</em>
<a name="48" href="#48">48</a>      <strong class="jxr_keyword">public</strong> OpacitySetterIE6() {
<a name="49" href="#49">49</a>      }
<a name="50" href="#50">50</a>  
<a name="51" href="#51">51</a>      <em class="jxr_javadoccomment">/**</em>
<a name="52" href="#52">52</a>  <em class="jxr_javadoccomment">     * Gets the current opacity value.</em>
<a name="53" href="#53">53</a>  <em class="jxr_javadoccomment">     * @param o UIObject to inspect.</em>
<a name="54" href="#54">54</a>  <em class="jxr_javadoccomment">     * @return The current opacity between 0.0 and 1.0</em>
<a name="55" href="#55">55</a>  <em class="jxr_javadoccomment">     */</em>
<a name="56" href="#56">56</a>      <strong class="jxr_keyword">public</strong> Double getOpacity(UIObject o) {
<a name="57" href="#57">57</a>          String str = DOM.getStyleAttribute(o.getElement(), <span class="jxr_string">"filter"</span>);
<a name="58" href="#58">58</a>          str = parseOrReplace(str, <strong class="jxr_keyword">null</strong>);
<a name="59" href="#59">59</a>  
<a name="60" href="#60">60</a>          <strong class="jxr_keyword">if</strong>((str == <strong class="jxr_keyword">null</strong>) || (str.length() == 0)) {
<a name="61" href="#61">61</a>              <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> Double(1.0);
<a name="62" href="#62">62</a>          } <strong class="jxr_keyword">else</strong> {
<a name="63" href="#63">63</a>              <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> Double(Integer.parseInt(str) / 100);
<a name="64" href="#64">64</a>          }
<a name="65" href="#65">65</a>      }
<a name="66" href="#66">66</a>  
<a name="67" href="#67">67</a>      <em class="jxr_javadoccomment">/**</em>
<a name="68" href="#68">68</a>  <em class="jxr_javadoccomment">     * Gets the current opacity value.</em>
<a name="69" href="#69">69</a>  <em class="jxr_javadoccomment">     * @param opacity the new opacity value between 0.0 and 1.0</em>
<a name="70" href="#70">70</a>  <em class="jxr_javadoccomment">     * @param o UIObject to inspect.</em>
<a name="71" href="#71">71</a>  <em class="jxr_javadoccomment">     */</em>
<a name="72" href="#72">72</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setOpacity(UIObject o, Double opacity) {
<a name="73" href="#73">73</a>          String filter = DOM.getStyleAttribute(o.getElement(), <span class="jxr_string">"filter"</span>);
<a name="74" href="#74">74</a>  
<a name="75" href="#75">75</a>          <strong class="jxr_keyword">if</strong>(filter == <strong class="jxr_keyword">null</strong>) {
<a name="76" href="#76">76</a>              filter = <span class="jxr_string">""</span>;
<a name="77" href="#77">77</a>          }
<a name="78" href="#78">78</a>  
<a name="79" href="#79">79</a>          <strong class="jxr_keyword">if</strong>(opacity != <strong class="jxr_keyword">null</strong>) {
<a name="80" href="#80">80</a>              filter = parseOrReplace(filter, <span class="jxr_string">""</span> + Math.round(opacity.doubleValue() * 100d));
<a name="81" href="#81">81</a>              DOM.setStyleAttribute(o.getElement(), <span class="jxr_string">"filter"</span>, filter);
<a name="82" href="#82">82</a>          } <strong class="jxr_keyword">else</strong> {
<a name="83" href="#83">83</a>              filter = parseOrReplace(filter, <span class="jxr_string">"100"</span>);
<a name="84" href="#84">84</a>              DOM.setStyleAttribute(o.getElement(), <span class="jxr_string">"filter"</span>, filter);
<a name="85" href="#85">85</a>          }
<a name="86" href="#86">86</a>      }
<a name="87" href="#87">87</a>  
<a name="88" href="#88">88</a>      <strong class="jxr_keyword">static</strong> String parseOrReplace(String filter, String replace) {
<a name="89" href="#89">89</a>          <strong class="jxr_keyword">int</strong> start = filter.indexOf(ALPHA);
<a name="90" href="#90">90</a>  
<a name="91" href="#91">91</a>          <strong class="jxr_keyword">if</strong>(start == -1) {
<a name="92" href="#92">92</a>              <strong class="jxr_keyword">if</strong>(replace != <strong class="jxr_keyword">null</strong>) {
<a name="93" href="#93">93</a>                  <strong class="jxr_keyword">if</strong>(filter == <strong class="jxr_keyword">null</strong>) {
<a name="94" href="#94">94</a>                      <strong class="jxr_keyword">return</strong> ALPHA + OPACITY + replace + <span class="jxr_string">")"</span>;
<a name="95" href="#95">95</a>                  } <strong class="jxr_keyword">else</strong> {
<a name="96" href="#96">96</a>                      <strong class="jxr_keyword">return</strong> filter + ALPHA + OPACITY + replace + <span class="jxr_string">")"</span>;
<a name="97" href="#97">97</a>                  }
<a name="98" href="#98">98</a>              }
<a name="99" href="#99">99</a>  
<a name="100" href="#100">100</a>             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
<a name="101" href="#101">101</a>         }
<a name="102" href="#102">102</a> 
<a name="103" href="#103">103</a>         <strong class="jxr_keyword">int</strong> alphaEnd = filter.indexOf(<span class="jxr_string">")"</span>, start + ALPHA.length());
<a name="104" href="#104">104</a>         String alphaBlock = filter.substring(start + ALPHA.length(), alphaEnd);
<a name="105" href="#105">105</a>         <strong class="jxr_keyword">int</strong> opacityStart = alphaBlock.indexOf(OPACITY);
<a name="106" href="#106">106</a> 
<a name="107" href="#107">107</a>         <strong class="jxr_keyword">if</strong>(opacityStart == -1) {
<a name="108" href="#108">108</a>             <strong class="jxr_keyword">if</strong>(replace != <strong class="jxr_keyword">null</strong>) {
<a name="109" href="#109">109</a>                 <strong class="jxr_keyword">return</strong> filter.substring(0, start + ALPHA.length()) + OPACITY + replace + <span class="jxr_string">","</span> + alphaBlock
<a name="110" href="#110">110</a>                 + filter.substring(alphaEnd, filter.length());
<a name="111" href="#111">111</a>             } <strong class="jxr_keyword">else</strong> {
<a name="112" href="#112">112</a>                 <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
<a name="113" href="#113">113</a>             }
<a name="114" href="#114">114</a>         }
<a name="115" href="#115">115</a> 
<a name="116" href="#116">116</a>         opacityStart += (start + ALPHA.length());
<a name="117" href="#117">117</a> 
<a name="118" href="#118">118</a>         <strong class="jxr_keyword">int</strong> opacityEnd = opacityStart + OPACITY.length() + 1;
<a name="119" href="#119">119</a> 
<a name="120" href="#120">120</a>         <strong class="jxr_keyword">for</strong>(; NUMBERS.indexOf(filter.charAt(opacityEnd)) != -1; opacityEnd++) {
<a name="121" href="#121">121</a>             ;
<a name="122" href="#122">122</a>         }
<a name="123" href="#123">123</a> 
<a name="124" href="#124">124</a>         <strong class="jxr_keyword">if</strong>(replace == <strong class="jxr_keyword">null</strong>) {
<a name="125" href="#125">125</a>             <strong class="jxr_keyword">return</strong> filter.substring(opacityStart + OPACITY.length(), opacityEnd);
<a name="126" href="#126">126</a>         } <strong class="jxr_keyword">else</strong> {
<a name="127" href="#127">127</a>             <strong class="jxr_keyword">return</strong> filter.substring(0, opacityStart + OPACITY.length()) + replace
<a name="128" href="#128">128</a>             + filter.substring(opacityEnd, filter.length());
<a name="129" href="#129">129</a>         }
<a name="130" href="#130">130</a>     }
<a name="131" href="#131">131</a> }
</pre>
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